Business in the US and Canada has been exporting increasingly large numbers of manufacturing jobs (to Mexico, Philippines, Taiwan, etc) and hiring off-shore transport workers since the mid-70's, hiring migrant and illegal labourers even longer; moving out whole factories or contracting for parts in the far east on a large scale since the 90's; and more recently outsourcing service jobs as well. At the same time, they're agitating (through bought-and-lobbied legislators) for deregulation and de-unionization, driving down the wages and benefits of North American workers. And demanding a tax break for every $billion they ship to a foreign tax-haven.
Government, labour and tax revenue are confined within the borders of each nation, sitting targets. Corporations, their operation and their profits are free to go anywhere, untouchable.
Fortunately, this is a self-limiting situation: the market for their products dries up and the economic system collapses. Unfortunately, it's always the poorest people who are under a collapsing structure.